<template>
  <div>
    <h2>随机点名</h2>
    <div class="box">
      <span>名字是：</span>
      <div class="qs">
        {{ item ? arr[k] : "这里显示姓名" }}
      </div>
    </div>
    <div class="btns">
      <button @click="fn1" class="start">开始</button>
      <button @click="fn2" class="end">结束</button>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: ['张三', '李四', '王五', '赵六'],
      item: "",
      k: ""
    }
  },
  methods: {
    
    fn() {
      this.k = Math.floor(Math.random(1) * 4)
    },
    fn1() {
      this.item = setInterval (this.fn, 50)
    },
    fn2() {
      clearInterval(this.item)
    },
  }
}
</script>

<style>
* {
  margin: 0;
  padding: 0;
}

h2 {
  text-align: center;
}

.box {
  width: 600px;
  margin: 50px auto;
  display: flex;
  font-size: 25px;
  line-height: 40px;
}

.qs {
  width: 450px;
  height: 40px;
  color: red;
}

.btns {
  text-align: center;
}

.btns button {
  width: 120px;
  height: 35px;
  margin: 0 50px;
}
</style>
